These are the treasure chest maps I have charted for each zone of Kul Tiras and Zandalar. Treasure Chests drop gray items (vendor) ranging 15-18 gold. Some drop above 100 gold. In some instances, Treasure Chests drop 7-22 Campaign Resources.
Campaign resources are needed to send Followers to War Missions, and to train more recruits.
Maps with an orange dot represent a Jani’s Treasure Trashpile, the ones I have found. Some provide loot. Others provide side quests by Jani with a gold reward.