Unnavigable

Mary's house was situated in a maze of one-way streets almost unnavigable for drivers unfamiliar with the area.

In about an hour the boat touched a sandy beach, surrounded with magnificent chestnut trees, amongst which the stream still ran, but so shallow and rocky as to be unnavigable.

Near-synonym: impassible

unnavigable website

A road journey of 70 miles past unnavigable rapids leads to Juba, from which it is seven days' steaming down river through to Kosti, on the Sudan Railways.

Nang county is the name given to the present administrative division of E Dakpo, the principal gateway to the sacred mountain of Tsari, and the region through which the Brahmaputra River cuts its way through an unnavigable 33 km horse-shoe gorge as it flows towards Longpo and Kongpo.

The vast plateau of the Massif Central was still the fortress it had been when the Arverni tribes held out against the Romans. Its rivers were unnavigable and its links to the rest of France practically non-existent.

The trail was unnavigable since the flood washed it away.