"哪里的小山"用英语可以说作"which small mountain"。

"Which"是英语中的一个疑问词，用来询问"哪一个"或"哪些"。它可以用来询问一个人或物体的名字或所在的位置，例如：

Which book do you want to read? (你想读哪本书？)
Which of these pencils is yours? (这些铅笔中哪一支是你的？)

"Small"是英语中的形容词，用来形容一个物体的大小。它可以用来形容一个物体的体积、面积或尺寸，例如：

She has a small house. (她有一个小房子。)
The cat is small, but very cute. (这只猫很小，但很可爱。)

"Mountain"是英语中的名词，用来指"山"。它可以用来指一个地方的山脉，或者指一座山的名字，例如：

The mountain is very high. (这座山很高。)
Mount Everest is the highest mountain in the world. (珠穆朗玛峰是世界上最高的山。)

下面是一些包含"which small mountain"的英文例句及其中文翻译：

Which small mountain are you talking about? (你在谈论哪座小山？)
I went hiking on a small mountain near my house. (我去我家附近的一座小山远足了。)
The view from the top of the small mountain was breathtaking. (从小山顶上看到的景色令人惊叹。)