Publisher's blurb:
There is a river that dips underground through a low-ceilinged cave before descending fairly gently under the grey hills to depths unknown. However, all it takes is a magic spell to lower the water level at the cave entrance to make this easily navigable by boat, as the river cave has a fairly high ceiling after the entrance...
User summary:
The maps in the series are in the item's gallery - all images are by Dyson Logos, made available under a "commercial" license, and released under CC-BY (https://creativecommons.org/licenses/by/2.0/deed.en)
The Heart of Darkling includes these enumerated and named maps:
Heart of Darkling Map 1A – The Demon’s Bridge
Heart of Darkling Map 1B – The Demon Halls
Heart of Darkling Map 2A – The Waystation
Heart of Darkling Map 3A – Swiftwater Monastery
Heart of Darkling Map 4A – The Weeping Outpost
Heart of Darkling Map 5A – The Bandit Tower
Heart of Darkling Map 6A – The Cove of Coals
Heart of Darkling Map 7A – The Augite Shore
Heart of Darkling Map 8A – The Hags
Heart of Darkling Map 9A – Shrines of Silver
Heart of Darkling Map 10A – DiTullio Islands
Heart of Darkling Map 11A – Bloodmarket Cave
Heart of Darkling Map 12A – Darkling Galleries
Heart of Darkling Map 12B – Gibberling Lake
Heart of Darkling Map 13A – The Drop
Heart of Darkling Map 13B – Cold Caves
Heart of Darkling Map 14A – Deception’s Bridge
Heart of Darkling Map 15A – The Pillars
Heart of Darkling Map 16A – The Stairs
Heart of Darkling Map 17A – Darklingtown North
Heart of Darkling Map 17B – Darklingtown South
Heart of Darkling Map 17C – Frogsport
Heart of Darkling Map 17D – East Frogsport
Heart of Darkling Map 17E – Mushroom Caves
Heart of Darkling Map 17F – Frog Tower
Heart of Darkling Map 17G – The Tunnels
Heart of Darkling Map 17H – Caverns District & Spillways
Heart of Darkling Map 17I – The Upper Tunnels