Ciasne [ˈt͡ɕasnɛ] is a village in the administrative district of Gmina Supraśl, within Białystok County, Podlaskie Voivodeship, in north-eastern Poland.

[1] It lies approximately 5 kilometres (3 mi) south-west of Supraśl and 12 km (7 mi) north-east of the regional capital Białystok.

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