Which preposition to use with sasin

in Occurrences 1%

The Açores are held to have been a continuation of the mountains of Estrella, which join the sea coast beside the town of Cintra; and the Sierra Verde, or Green-mountains, which reach the coast, near the city of Sasin in the land of Cucu, or the island of Moudim in which Algarbe is situated, are supposed to have reached to Porto Santo and Madeira.

Which preposition to use with  sasin