Once, we camped along Chalk Creek.

这是2022年新高考全国卷1语法填空中的一个句子。

请问句中的 along 是什么用法？根据常识，我们应该是“在……边上”（beside）露营吧？怎么可能是“沿着……”（along）露营呢？这不符合常理啊？

附相关上下文：

Some of our memories are funny, especially from the early years when our children were little. Once, we camped along Chalk Creek. I was worried that our 15-month-old boy would fall into the creek (小溪). I tied a rope around his waist to keep him near to our spot. That lasted about ten minutes. He was uncomfortable, and his crying let the whole campground know it. So instead of tying him up, I just kept a close eye on him. It worked — he didn’t end up in the creek. My three-year-old, however, did.