The easiest location to get to for maps on Botanist is just outside of Limsa. Go out the Zephyr Gate to Middle La Noscea, and there's a level 50 logging area a short trip NW just past the first bridge.
If you've only got Miner, there are level 50 quarrying nodes just north of Swiftperch (east of Aleport) in Western La Noscea. In fact, I just got a Peisteskin map confirming the location.