where
there is a small river for us to live in,是一个完整的句子,主谓宾啥也不缺,虽然我不明白为什么要住在河里,但which解释不通.
另外,外语中经常有where there 连用的用法,如：
where there is a will there is a way.有志者事竟成
where there is reek,there is heat.无风不起浪