Learn Spanish (Latin America): Seguimos caminando alrededor del lago subterráneo. - We kept walking around the underground lake.

The phrase alrededor de means 'around'. When the preposition de is followed by the masculine article el, they combine into the mandatory contraction del. Since lago (lake) is a masculine noun, it uses el, giving us alrededor del lago.

How does seguimos caminando translate to 'we kept walking'?

In Spanish, to say you keep doing or continue doing an action, you use the verb seguir (to follow or continue) followed by a gerund (a verb form ending in -ando or -iendo). Here, seguimos pairs with caminando (walking) to express 'we kept walking'.

Is seguimos in the present tense or the past tense here?

It could be either! The nosotros form seguimos is exactly the same in both the present tense ('we keep walking') and the preterite past tense ('we kept walking'). You have to rely on the surrounding context of the conversation or story to know which one is meant.

Why is the word subterráneo placed after lago?