The northern part of Tvijälp, which lies off Westend, is forested while rocks dominate the south part of the island.
The centre of the island is low-lying ground. Tvijälp has fine water meadows. The island’s nature is varied and in its own way tells of the former life of fisherfolk in the Espoo archipelago. Camping in tents is not permitted, not are there services on the island.