I live in an area of a border to another country. There is a long canal separating to major cities and countries, and very often I see people very close < 2km, but on the other side of the canal. That would require me traveling 10km south to the bridge, crossing an international border and driving up again 10km to meet the person. While gps shows that we are close in a radius, often borders, rivers and other geographical landscapes make way far than possible to meet, making it impossible due to lack of transportation. Being able to constraints a search in a country or city or even an area would be great for cases where we want to meet people within reach, and not to have to swim the nordic sea, a river, cross a border, or climb a mountain to get to a hook up.