The oldest WiFi standards, at 1 Mb/s or 2 Mb/s, could easily establish point-to-point links at 50 km or even 100 km, with the condition of using good directive antennas mounted on high-enough masts.

This could be used to implement bridges between LANs located at great distances one from the other. There were commercial products implementing such LAN bridges through WiFi.

When an access point must transmit and receive omni-directionally, to reach any station placed randomly around it, that diminishes a lot the achievable range.