Right-click once on a tile that is visible and you should see a blinking white diamond outlining the tile and something like this at the top of the right-hand info bar:
Loc: (25,35) 9
This tells you the tile's location (measured from the upper left corner of the unwrapped map - when you get to (0,0) on a "round" map the next left one will be the far right side), and the "continent number" of the land you clicked on. Each island is assigned a number, and some lakes that are large enough are also assigned numbers. The main ocean is number 1, and the very first island will also be assigned number 1 too, so when there is one large continent it can be difficult to tell them apart. Small lakes are assigned the number 63 - note that many things in Civ2 are base2, including limit of 64 numbers for islands and seas. Black-clicking does not tell you what "kind" of land is under the black, just whether anything might be there and whether it might be connected to a revealed continent number.
