The only spacecraft to visit Triton was Voyager 2

which flew by the moon in 1989 and imaged the southern hemisphere of the moon. Below is a simplified geologic map of Triton based on the Voyager 2 images. You will want to examine  a much larger version of this image to answer the questions below.  [Link to larger version of Figure 14]. You should be able to magnify this; you can also download and open with a photo viewer or paint program and magnify.