Create a view that filters content type based on a different content type

Hi all,

Very new to Drupal, so apologies if I don't have the terminology down (please educate me!). I imagine a similar/identical use case has been identified in the forums before, too, so please feel free to pass me links to relevant info.

I have two content types on my site: "mountains" and "trip reports." For each mountain (page), I want to add a block with the most recent trip reports. One way I know I could do this is to create a view as a block, and add that block's visibility to the "mountains" page type. But how do I construct my view?

Say I have content for Mount Foo, and I have five trip reports for climbers that have made the trip, how do I construct my view so that of all the trip reports on my site, my block displays links to the five trip reports unique to Mount Foo? Is this a contextual filter? A relationship? Is this a job for Views Field View?

Thanks for the help!