There are maps online [1],[2] that you can use. Oceans and deserts are the darkest, but national parks and sparsly populated areas are also a good choice. Of course, most of the time there’s nothing ‘nearby’ as population centers are always well lit.

[1] https://www.lightpollutionmap.info/

[2] https://djlorenz.github.io/astronomy/lp2020/