Continuing eastwards, the river is crossed by Iping Bridge at Iping, a narrow stone bridge with five arches dating from the seventeenth century.
Just a few miles from Paro, with its delicate features perched precariously on a narrow stone ledge some 700 metres above the valley floor, this is Bhutan's most popular tourist destination.
At first sight, a roughly converted school building in Battersea with whitewashed brick walls, cement floors and a narrow stone staircase did not hold out much promise of fun and glamour.
It sprawls over more than 80 acres, a landscape of ruined structures along a grid of narrow stone streets.
"It was like being in a beautiful Tuscany calendar — narrow, steep stone streets (too narrow for cars), narrow stone houses with tile roofs, window boxes with geraniums, and long, long views of heavily forested hills," she said.
This is a narrow, tall, stone monument with a pyramid shape at the top.
And an idealized countryside it is: an extremely narrow stone-walled, wood-beamed dining room is separated into three sections, its niches filled with crockery and conserves.
Courtyards, canals and inward-facing Chinese houses linked by narrow stone alleys constitute a wonderful maze at the centre of which is, surprisingly, an American bar complete with a neon sign and ancient Philip Morris cigarette advertisements.
The only sound was a clucking chicken and the breeze tinking the well bucket against the narrow stone wellhead.
Place the stones on the sand gently, with a narrow gap in between them.
