There isn't a specific, universally accepted term for a canyon with a wall at the end. However, depending on the context and specific features, you could use some descriptive terms:

Based on the wall's nature:

* Canyon with a terminal cliff: This is a general description highlighting the wall's presence at the canyon's end.

* Canyon with a natural dam: If the wall is formed by a natural rock barrier.

* Canyon with a waterfall: If the wall ends with a waterfall cascading down.

* Canyon with a rock face: A general term for a vertical or near-vertical rock formation.

Based on the canyon's shape:

* Box canyon: This is a specific type of canyon with steep walls on all sides, often including a closed end.

* Blind canyon: This term is generally used for canyons that don't have a clear exit, which could include a wall at the end.

Other possibilities:

* Dead-end canyon: This emphasizes the lack of a throughway.

* Canyon with a cul-de-sac: This term is more informal and compares the canyon's end to a street ending in a dead end.

Ultimately, the best term to use would depend on the specific characteristics of the canyon and the context in which you are discussing it.