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土卫六具有巨大的河道网络，有主干，有支流。有冲积平原，也有三角洲。在土卫六上，甲烷和乙烷等等碳氢化合物分子也会蒸发，也会凝结成云层，然后再汇聚成“雨”落回到地面。落回地面的液态碳氢化合物也会汇聚成“河流”，小河流水哗啦啦，汇集到大河，大河最后流进液态海洋，说术语叫做“地表径流”，这个过程和地球上的水循环非常类似。只是土卫六上的温度实在是太低了，这个过程进行的非常非常的缓慢，就像放慢镜头一样。往往是液体要蒸发很多年。才能在空气中攒出一场大暴雨的量。要么几年不下，要么就下个狠的。卡西尼号这么多年来也只探测到一场赤道地区的甲烷暴雨……
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