Jacksonville definitely has one of the largest (perhaps the largest?) overall municipal park systems. The largest “park” I found was called the Loblolly Mitigation Preserve at 4199 acres (so, just off the top 15 I limited it to), which seems to be related to a public-private endeavor that earns “wetlands credits.” But the preserve doesn’t seem to be listed by the city along with its other parks or even “Environmental Parks,” so even if it fell within the top 15 I listed here, I probably wouldn’t have included it.