This guide will show you where to find all Gem Fragments on Rivers using a vehicle for one of the Shanta Quests in Fortnite Battle Royale Chapter 3 Season 1.
For this Gem Fragment Quest, you need to collect them on rivers using a boat (a car works too, but not very efficiently).
Boats spawn where the rivers meet the sea, so land there to get one. Follow this video for the locations of all the Gem Fragments on the River, there are 9 in total that you need to collect to complete the challenge.
Watch the video below for a visual guide.