The T-bane trip to the Sognsvann terminus is not as pleasant a journey as the T-bane trip to Frognerseteren (see above) – the landscape is flatter and you never really leave the city behind – but Sognsvann is but a brief walk from Sognsvannet, an attractive lake flanked by forested hills and encircled by an easy four-kilometre hiking trail. The lake is iced over until the end of March or early April, but thereafter it’s a perfect spot for a picnic or a swim, though Norwegian assurances about the warmth of the water should be treated with caution (or mirth). Forest footpaths link Sognsvannet with Frognerseteren.