Sardegna West Coast: Part 1 Alghero to Bosa

Published on:  | Last updated: 23 December 2019

SP105 coastal road between Alghero and Bosa

SP105 coastal road between Alghero and Bosa

At a glance


44 kms


Moderate. There are no really big climbs, but there are quite a lot of smaller ones.


This section of route is on quiet roads.


Entirely on surfaced roads in good condition.


The route is very easy to follow using the normal road signs.


You couldn’t wish for a better intro­duction to Sardegna. The route starts off on the bastioni of Alghero, before heading out onto a gorgeous stretch of coastal road that takes you to Bosa. Bosa, with its castle, and pretty centro storico is one of the island’s most attractive towns.


  • the glorious coast road between Alghero and Bosa
  • Bosa with its castle and colourful centro storico


There are only a couple of beaches on this section of the route: the Poglina beach a few kilometres from Alghero, and the beach at Bosa Marina.

Alghero: catapult on the Bastioni Marco Polo. On the horizon is the Capo Caccia.

Alghero: catapult on the Bastioni Marco Polo. On the horizon is the Capo Caccia.

Map and altitude profile

Powered by WP-GPX Maps

tips for using the map

Map screen grab

Run your cursor over the graph to show the elevation, and distance from the start, for any given point on the route. (Note: the altitude graph is not shown where the route is flat).

map detail

Click the little icon in the right-hand corner to see the map fullscreen

Route description

Alghero to Bosa

If you’re in a hurry you can follow the road as it skirts round Alghero’s centro storico, but the most scenic option is to follow the bastioni (the defensive seawalls). Parts of the centro storico are a pedes­trian zone however, you can ride along the bastioni as always, you need to apply common sense and discretion. If it’s crowded, you may need to get off and walk at the narrow points.

To get up to the bastioni without having to carry your bike up the steps you need to turn right onto the Banchina Dogana quayside and then turn left through the Porta a Mare (there are no-entry signs on the Porta a Mare - but also a cyclist-pedes­trian sign). Turn right into the Piazza Civica which takes you past the Duomo (Cathedral) and then turn right again in front of the Duomo and onto the Via San Erasmo. Just a little further on (after the Movida restaurant) is a piazza where there’s a ramp that takes you up to the Bastioni Magellano. The piazza is shown on the map as the Piazza San Erasmo but seems to have been renamed the Piazza Pasqual Gal. 

Wildflowers beside the SP105

Wildflowers beside the SP105

On a clear day you can see from the walls across the golfo to the Capo Caccia.

You can follow the bastioni to the Torre Sulis where you pick up another cycleway which takes you to the Mirador Giuni Russo at Calabona on the edge of town. From here you need to pick up the SP105. It’s a truly beautiful coastal road that threads its way between the sea and a high escarpment that runs parallel to the coast. The day I rode this way the peaks were shrouded in cloud, but according to the map they rise 600 or so metres above the road.

The road heads inland and climbs to just over 100m altitude before descending again down to the coast at the Spiaggia di Poglina.

On this section the real star of the show was the wildflowers and the foliage of the macchia. Silvery greens, blues, orange, and yellow gorse. Mind you, there are some dramatic rock forma­tions along the way — in particular, there’s one that looks like a gargoyle high above the road. Credit to the local author­ities, rather than simply demolish it they have built a canti­levered shelter to protect the road from rockfalls.

SP105 coastal road between Alghero and Bosa

SP105 coastal road between Alghero and Bosa

At about 21 km from Alghero the road starts its final climb going from about 150m to 367m, levelling off about 15 kilometres from Bosa. As you climb, you should, on a clear day, be able to see all the way back towards the Capo Caccia. A kilometre or so further on, at the border with the Provincia di Oristano the road becomes the SP49. 

Look out for the Torre Argentina on your right as you descend towards Bosa. If you are heading for Bosa itself, don’t cross the bridge over the river into Bosa Marina, but instead bear left —following the signs for Bosa. This will take you along the pretty riverside, and you should, on your right-hand side, catch your first sight of the town itself with its castle above it.

First sight of Bosa from the riverside

First sight of Bosa from the riverside


Bosa is known for its houses painted in bright jaunty colours. I don’t know why it is, but places like Bosa are defin­itely an exception (the only other place I’ve been to that you could compare with it is Burano on the Venetian lagoon). In general houses in Italy are painted in very safe conser­vative colours — I once watched a comedian on a prime-time television show doing a whole story about the bitter row in the condominium about what shade of terra­cotta to paint the building. When you come to a place like Bosa it’s as if the cork has been taken out of the bottle and the result is full-on exuberance.

Bosa is defin­itely on the tourist circuit, but it’s still the sort of place where the local boys kick a football around the main square or tear round it on their bikes. Some parts of the centro storico feel pretty poor and run down.

Houses in the centro storico of Bosa

Houses in the centro storico of Bosa

It’s worth the climb up to the Castello Malaspina (also known as the Castello Serravalle, or more simply as the Castello di Bosa) for the view from the castle walls over Bosa and beyond. Don’t miss the Capella Palatina with a beautiful cycle of 14th century frescoes that is unique in the island. 

You can ride up to the castle if you have enough energy left — although I wouldn’t even think about trying to ride through the centro storico itself. In summer the castle and chapel are open every day from 10:00 admission is 5.50€ (check times and prices: Castello di Bosa opening hours and prices).

Frescoes in the Chiesa di Nostra Signora de Sos Regnos Altos

Frescoes in the Chiesa di Nostra Signora de Sos Regnos Altos

More information

Places to stay

Hotels and B&Bs etc

There are hotels and B&Bs at Bosa (and nearby Bosa Marina). In Bosa I stayed at the very reasonably-priced B&B Sa Rocchitta.

Find and book places to stay with pages for places on this section of the route:

About these links

If you use these links to book accom­mod­ation will pay me a small part of their commission. This helps support the costs of producing this site.

I use to find and book places to stay when there are no campsites in the area. The large majority of hotels and many hostels are now on ‘Booking’. I like it because it means that I can get almost-instant confirm­ation. The rating system is also a reliable guide to the quality of the accommodation.

I’ve never had a problem finding places to keep my bike —even if it’s a cupboard or store room. I always use the ‘special requests’ field on the booking form to tell the hotel that I’m travelling with a bike, which gives them the oppor­tunity to let me know if there’s a problem.

Many properties offer free cancel­lation but it’s a good idea to check the condi­tions as these vary from property to property.


So far as I know, there are no hostels on this section of the route.


There are no campsites in or around Bosa. There are a couple of campsites to the north of Alghero: the Camping Laguna Blu Calik at Fertilia and La Mariposa on the outskirts of Alghero. 

  Campsites map:  FT-Sardegna-West-Coast-campsites-map
show map in overlay  
  |  FT-Sardegna-West-Coast-campsites-map  show map in new window 

Transport and services


The nearest rail station to Bosa is at Oristano with services to Olbia and Cagliari.


Tourist information

Other tourism resources

Places of interest

Castello di Bosa

Goat seen from the SP49 coastal road on the way to Bosa

Goat seen from the SP49 coastal road on the way to Bosa

Articles in this series

Bosa: bird building a nest inside a streetlamp

Bosa: birds building a nest inside a streetlamp

Get in touch

Please get in touch if you find any errors in the information, or if there’s anything, good or bad, that you’d want other cyclists to know.

Join the mailing list?

If you’ve found this site useful why not sign up to the mailing list for occasional updates about new routes.