A Small Description
Sand Land is by Akira Toriyama, the author of Dragon Ball, Dragon Ball Z, and Dr. Slump. This manga only has one volume in the series (Kind of like a oneshot).
Sand Land Volume 1
In the far future, war has detroyed the entire Earth, leaving only a huge waste land where water is controlled by a super greedy king. In search of the long-lost lake, Sheriff Rao asked the demon kingfor help. He ends up getting the kings son, Beelzebub, and his assistant named Thief. Together, the trio sets off across the desert to find the long-lost lake.