This is weird self-made custom world and yes, It's hard to explain so go see yourself.
Preset: {"coordinateScale":50.870136,"heightScale":1130.6589,"lowerLimitScale":712.9842,"upperLimitScale":1442.8641,"depthNoiseScaleX":112.84909,"depthNoiseScaleZ":284.22485,"depthNoiseScaleExponent":0.01,"mainNoiseScaleX":849.7504,"mainNoiseScaleY":2967.9773,"mainNoiseScaleZ":1902.2368,"baseSize":11.623297,"stretchY":4.2345076,"biomeDepthWeight":2.785716,"biomeDepthOffset":0.75406957,"biomeScaleWeight":2.35466,"biomeScaleOffset":1.6180005,"seaLevel":20,"useCaves":true,"useDungeons":true,"dungeonChance":8,"useStrongholds":true,"useVillages":true,"useMineShafts":true,"useTemples":true,"useMonuments":true,"useMansions":true,"useRavines":true,"useWaterLakes":true,"waterLakeChance":4,"useLavaLakes":true,"lavaLakeChance":80,"useLavaOceans":false,"fixedBiome":-1,"biomeSize":4,"riverSize":4,"dirtSize":1,"dirtCount":0,"dirtMinHeight":255,"dirtMaxHeight":0,"gravelSize":1,"gravelCount":0,"gravelMinHeight":255,"gravelMaxHeight":0,"graniteSize":1,"graniteCount":0,"graniteMinHeight":255,"graniteMaxHeight":0,"dioriteSize":1,"dioriteCount":0,"dioriteMinHeight":255,"dioriteMaxHeight":0,"andesiteSize":1,"andesiteCount":0,"andesiteMinHeight":255,"andesiteMaxHeight":0,"coalSize":17,"coalCount":20,"coalMinHeight":0,"coalMaxHeight":128,"ironSize":9,"ironCount":20,"ironMinHeight":0,"ironMaxHeight":64,"goldSize":9,"goldCount":2,"goldMinHeight":0,"goldMaxHeight":32,"redstoneSize":8,"redstoneCount":8,"redstoneMinHeight":0,"redstoneMaxHeight":16,"diamondSize":10,"diamondCount":35,"diamondMinHeight":0,"diamondMaxHeight":255,"lapisSize":7,"lapisCount":1,"lapisCenterHeight":16,"lapisSpread":16}