Tips
Glen Sobel
September 11, 2025
Hiking
Costaérès Castle (French: Château de Costaérès, Breton: Kastell Kostaerez) is a neo-Gothic manor house built in the 1890s. It was commissioned by the Lithuanian-Polish mathematician, electrical engineer, and inventor Bruno Abdank-Abakanowicz on a previously uninhabited island of the same name. Because of its magnificent architectural design, it is also referred to as a castle (French: château).
The island with the castle is located in the Côtes-d'Armor department in Brittany, France, off the Côte de Granit Rose. Administratively, the manor house belongs to the municipality of Ploumanac'h, but is still located within the municipality of Trégastel.
The island with the castle is located in the Côtes-d'Armor department in Brittany, France, off the Côte de Granit Rose. Administratively, the manor house belongs to the municipality of Ploumanac'h, but is still located within the municipality of Trégastel.
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•Théo Moullec
November 17, 2022
Hiking
Beautiful view of this mansion which bears the name of the island on which it was built.
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•Fred Urrutia
September 11, 2024
Hiking
The Château de Costaérès, located on a rocky islet off the Pink Granite Coast in Brittany, is a true jewel in the middle of the waters. This castle, surrounded by maritime pines and rocks sculpted by the sea, offers a breathtaking landscape, particularly at high tide when the island seems to float on the water. Accessible only at low tide or by boat, this mysterious place attracts visitors for its wild beauty and enchanting setting.
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•Routes here
Best routes to View of Château de Costaérès
4.8
(272)
1,151
hikers
5.36km
01:23
30m
30m
Hike the easy 3.3-mile (5.4 km) La côte de granit rose loop from Ploumanac'h, exploring unique pink granite formations and coastal views.
Easy
4.8
(561)
3,473
hikers
12.6km
03:22
140m
140m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
Moderate
4.9
(211)
1,162
hikers
19.0km
04:55
100m
100m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
Moderate
Details
Informations
Elevation 10 m
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Sunday 1 March
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