Which is why my first thought was, "L?" because the water looks like a natural boundary. Only after looking again did I see a Z.

I think tilting it slightly straighter would've helped. Here it is tilted just 10 degrees -

Though it's still kinda 7-y. That chunk of farmland at the end makes my mind want to discard the bottom part entirely. It's neither the same color nor expected shape.

Edit: now I notice the circle above it, making a lower case "i" possible. Such fantastic ambiguity.