Remember: in Spanish, the most common way of expressing dimensions is tener/ser/medir+ de+noun/adjective. The adjectives largo and alto alternate with the nouns longitud and altura respectively; anchura is used less as an alternative to ancho.
-¿Cuánto mide de largo? — How long is it?
→El muro mide/tiene 20 metros de largo/longitud
-Tiene dos metros de ancho (/anchura) — It is two metres wide
-Es una mesa de 1 metro de alto / altura — It's a 1-metre-high table
-La piscina tiene dos metros de profundidad — The pool is two metres deep
