A map of the Feywild heavily inspired by Dungeons and Dragons Lore.

The Feywild is a plane of existence adjacent to the mortal world we call home. It is a more vibrant and colourful version of our plane where supposedly, the dreams of mortals can shape the terrain. The spirits that pass on when we die become the spirits that inhabit the Feywild, eventually transforming into Faeries and Fae creatures of many different shapes, sizes and temperaments. This has stagnated in more recent years due to religion drawing souls to the planes beyond the Astral Sea. Now the plane is ruled by Archfey who have had countless time to practice their magics. But as beautiful and enigmatic as the Fey and the Feywild may seem, they are a crooked mirror of the real world, much like one you might find in a circus funhouse.

The Fae take things very literally, especially promises. They can take names, hands and unborn children from unsuspecting visitors with loose lips. Eating and drinking Fey food can ensure that you never leave the Feywild again. But as chaotic and unpredictable as the Fey may be, they abide by the rules of Hospitality and the Rule of Threes. Three Queens, Three Wishes, Three Questions, Three Answers and so forth. They have noble and powerful beings called Archfey which rule from the Summer Court and Winter Court. The Courts of Spring and Autumn are usually subservient or less important and their whole society tends to have a matriarchal dominance. The Queens are the true rulers while the Kings are merely consorts or generals in their armies. You may also find Maidens, Ladies, Mothers and Crones of incredible power here.

The Feywild seasons are locked geographically and regions grow stronger or weaker depending on the time of year in the mortal world. It is always summer in the Summerlands, etc. And in the Vale of Long Night it is always night. Some places slip in and out of the Feywild like the city of Astrazalian, and the terrain is constantly changing. Distance is measured in a place's spiritual connection to another, or sometimes by rules the Fey make up themselves. For this reason, it supposed to be unmappable.

Out of lore, I've found this makes for a frustrating experience to navigate. However, I've played the Descent into Avernus Dnd module by Wizards of the Coast. It came with a glossy foldout map of Hell and told the DM that the mapmaker went insane while creating it so some of the landmarks might not be accurate. For this reason, I think it wouldn't be unreasonable to tell your players that the person who made this map of the Feywild is certifiably insane. (This will save you grief as a DM when/if complicated questions crop up. Just say a madman did it! since this is not entirely inaccurate ( ͡• ͜ʖ ͡• )

DnD Lore Locations you can look up for modules/story:

• Winter Court
• Summer Court
• The Lake of Frozen Tears
• The Vale of Long Night
• The Howling Forest
• Shinaelestra
• Cendriane
• The Murkendraw
• Mithrendein
• Nachtur
• Plains of Echoing Thunder
• The Summer Forest
• The Temple of Leaves
• Senaliesse
• Maze of Fathagn
• Brokenstone Vale
• Astrazalian
• Harrowhame
• The Court of Stars (floating over Autumn next to a mountain)

Other locations are inspired by Faerie Lore or Grimm Fairytales and their derivatives.

Powerful NPCs from DnD lore:

• Queen Titania/Tiandra and King Oberon (the Green Lord) are seated in the Summer Court.
• The Queen of Air and Darkness/Mab in the Winter Court.
• The Pale Prince lives in a fortress on the Lake of Frozen Tears.
• Baba Yaga could be anywhere. She fast-travels by flying around in her mortar and pestle/big wooden bucket with a broom. She lives in a Hut on Chicken Legs that moves around by walking and can be found in any forest. Caution to those who enter the Hut when she is not home.
• Cernunnos, the Lord of the Hunts may also be seen riding through any of the forests with a big pack of hunters. He is frequently joined by Oberon in the Summer Forest.
• Nachtur is the goblin capital and is ruled by the nasty hobgoblin named Great Gark (I have placed this inside a volcano for flavour and dungeon material. You're welcome).
• The Murkendraw is a massive endless swamp and can be host to any number of nasty critters including Pfilosfyr the Carrion King, known for his many fungal clones and mycelium minions. 
• In Brokenstone Vale, you will find lycanthropes and shifters that depend upon the moon, hence their proximity to winter and night. This place is ruled by Viktor Kazan, the Lycan Lord.
• Nearby, the island city of Astrazalian spends half the year in the mortal plane and is ruled by Lady Shandria.
• The Silver Lake is home to the Lady of the Lake if you want to reenact some Arthurian myth like they did with Geralt in Witcher 1.
• The Floating Forest is home to the Pegasi and Lurue the Unicorn Queen (Alicorn). I have put a little tower there for some Eladrin Pegasus Keepers/Servants depending on how intelligent you make the winged horses.
• In the Gardens of Pleasure, you will most likely find satyrs, including Hyrsam, the Prince of Fools.

I have left the White Well purposefully off the map. You can place it anywhere in the Winterlands. Should your players find it and the Lady of the White Well, she may grant them a boon. Those she falls in love with, become enamoured and earn her blade. They become champions who seek to free her from banishment by becoming her true love. All have died in the attempt.

Additionally, some places may cross over into other planes. The Vale of Long Night and The Dark Forest cross into the Shadowfell where the latter becomes the Dead Forest. The Murkendraw may also cross into the Shadowfell while Nactur is closer to the plane of fire. The Feysea leads to islands and the Court of Seafoam and the Court of Coral and continues into the plane of Water. The Primeval Forest spills over into Arborea and Brokenstone Vale spills into the Beastlands.

The Isle of Dreams is made up. If you ever reach it, your players will find the world of their dreams and can choose to stay (and become thrall to the Dreamlord) or go back with a single-use stone. Breaking it grants one use of the Wish spell. Make them roll a wisdom save.

Honeysuckle Lake is made of honey which makes all the water in the Feywild taste sweet. However, running water is very dangerous to Fey and can wash away their magic. You can see it creating artificial boundaries in the form of rivers. The honeywater in Honeysuckle Lake however, does not flow so quickly and is very viscous and sticky. Dipping a hand into it may not remove a Fey's magic but it can be just as dangerous. The honey is stronger than concrete and has known to pull unsuspecting honeyguzzlers into its grasp.

This is all based on my own reading and research and imagination, so feel free to change it up! And change the map to better fit your story.

Happy hunting