Homework / test English to Chinese Other Media / Multimedia Punctuation for subtitling

I need help with the more accurate translation for the word 'along'.

This is for a subtitling test!

The sentence is as follows:

He said he was out there walking his dog along the bluffs above El Matador, right?

他說他出去遛狗就正在埃爾瑪塔多爾上方的懸崖,對吧？

He said that he was up there walking his dog along those bluffs above El Matador.

他說他是在上面遛狗就沿著在埃爾瑪塔多爾上方的懸崖

Did I get it right? Is there anyone who can help me to translate the word 'along' in this context?

Localization for Taiwanese audiences!

And also I translated bluffs as cliffs. Any idea if this is right?

Thanks, dear friends!!