2 POIs in Verdant Brink
The first you just need to walk up/near.
The second is in the canopy. That is the area for Axemaster Gwyllion. You can take the chopper from Faren’s Flyer or do some gliding with updrafts.
Blighted Depths one: From Mellagan’s WP run north off the cliff and glide down over the bridge. There are a lot of Mordrem in there, so you may want to be ready to u-turn back to the bridge the moment the PoI pops. While you’re there, the mastery point is reached by gliding along the east side of the grove area and curving north until you see a series of stair-step updrafts.
Khisanth covered the other one well enough. Check the timer at http://dulfy.net/2015/11/09/gw2-hot-maps-timer-famme/ to see when the Night Bosses are up, that’s when you want to get to a chopper. Since the axe master is a meanie, if no one’s attacking him try to glide over the poi and then well away from that island before he can tag you with his one-shot marker.
You can also get to the axemaster PoI in the day time with updrafts and maybe lean techniques for the additional endurance.