你需要判断这个地点在从句中是充当宾语还是状语。
如果是宾语用that/which，状语的话用where或者介词+which。
介词+which的用法举例：
I went to the park in which I used to play games with my friends.
我去了从前我和朋友一起游戏的公园。
We went straight along the road, by which many cars parked.
我们沿一条路直走，路两旁停了许多车。
如果先行代词前面有一个逗号，就是非限制性定语从句，一定不能用that。
例如：
He called the ambulance for the woman, which saved her life.
他为她拨打急救热线，（他的这个行为）救了她的命
只能用which，不能用that
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