In these sentences, should we use 'which' or 'where' to combine them?
1. The city is crowded. I live in that city.
2. The park is beautiful. I often visit this park

Question

Answer

There are several different ways to handle these sentences, but I'd probably go with:

(1) The city where I live is crowded. 
OR (1) The city I live in is crowded.

(2) The park I often visit is beautiful. 
OR (2) This park that I often visit is beautiful.

Answer

1. The city where I live is crowded. 
2. The park which I often visit is beautiful.

I hope this helps :)