I read somewhere that 100/1000 baseT has
max segment 100m
max diameter 200m
well this means after 100m needed REPEATER or HUB or SWITCH to reach the 200m? after the 200m what must exist to reach eg 300m?
I've run 100Mbit to 1/2 mile by adding a SWITCH every 300ft (~100m). This was a temporary (2 week) concert venue in the middle of nowhere.
If you cannot get power run to run a switch, use PoE/Power Over Ethernet, and compatible switches. PoE is essentially breaking out the blue and brown pairs, and using Blue for +V and Brown for Ground. At the switch, break out the Blue/Brown, and connect to the power jack needed.
If your switches need line input power, eg 120/220VAC, then PoE will not work, it is only rated to 48VDC.
For longer and permanent runs, I'd suggest fiber.
Used cheap 4 port Linksys Switches inside Waterproof enclosures. I had to replace one in the first week due to theft.
Multi-mode fibre is good to about 500 meters. Single node fibre will give you anywhere between 5Km and 50km+ depending on the fibre and light frequency used.