Could a river on Earth be made of a liquid other than water?

So far as I can research, all rivers on Earth are flowing water. There are other substances that are liquid at room temperature. Are there any natural processes that could create a river of something other than water? I'm not talking just emptying a reservoir... I'm taking like a grove of maple trees making enough syrup to canoe on (not plausible, just for example) or similar renewable cycle to keep the river flowing. I've been trying to design one with no luck. (Acceptable would be a natural pump that recycled the fluid back to the start. I only need it to flow about 50 km.)

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Could a river on Earth be made of a liquid other than water?

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