Each level loads a struct of areas using function 0x800F78E4. I uses this structure to find the pointer to the current area in the main stage table.

Level struct (800be500):
{
/*0X0*/ U32    WORLD
/*0X4*/ U32    LEVEL
/*0X8*/ U32    AREA
/*0XC*/ U32    WARP/DIRECTION
}

The pointer to the main stage table is gotten by using this formula:

WORLD*48+LEVEL*4 loaded from offset 0x800d1f98(table of ptrs)

Each Area is then just an additional 0x24 from that level pointer.

The table at 0x000783F4 in ROM (0x800D01A4 in RAM) references data for each stage in the game. For each stage there is an array of area structs. Each array is terminated with an empty struct.

struct StageArea
{
  /*0x00*/ u32   liGeoBlockA;      // List-index of primary Geometry Block
  /*0x04*/ u32   liGeoBlockB;      // List-index of secondary Geometry Block
  /*0x08*/ u16   skyboxId;         // Skybox ID
  /*0x0A*/ u16   background color; // BG color (loaded from color table at 800D478C)
  /*0x0C*/ int   musicId;          // Music ID
  /*0x10*/ u32   biAreaSetup;      // Bank-index of area stup block 
  /*0x14*/ u16   Death Camera;     // Determines how far the camera follows kirby when falling into void/death
  /*0x16*/ u16   unk16;            // Cutscene related?
  /*0x18*/ u32   biDustSettings;   // Bank-index of Dust particle settings
  /*0x1C*/ u32   biDustImg;        // Bank-index of Dust particle image
  /*0x20*/ char *areaName;         // Pointer to developer ASCII level name
};

These are the locations of each level in RAM and ROM. Each area in these levels goes in sequential order. Meaning to get to Level 1-1 Area 2 you need to add 0x24 to 0x800d01a4.

The Table that has these locations is located at 0x7A1E8 in the ROM and 0x800d1f98 in RAM

* World 1-1: 0x800D01A4	World 1-2: 0x800D027C	World 1-3: 0x800D039C	World 1-4: 0x800D0528	World 1-5: 0x
* World 2-1: 0x800D0570	World 2-2: 0x800D066C	World 2-3: 0x800D078C	World 2-4: 0x800D08F4	World 2-5: 0x800D0A5C
* World 3-1: 0x800D0AA4	World 3-2: 0x800D0BC4	World 3-3: 0x800D0CE4	World 3-4: 0x800D0E28	World 3-5: 0x800D0F48
* World 4-1: 0x800D0F90	World 4-2: 0x800D10B0	World 4-3: 0x800D11F4	World 4-4: 0x800D12F0	World 4-5: 0x800D1434
* World 5-1: 0x800D147C	World 5-2: 0x800D159C	World 5-3: 0x800D16BC	World 5-4: 0x800D1824	World 5-5: 0x800D1968
* World 6-1: 0x800D19B0	World 6-2: 0x800D1A64	World 6-3: 0x800D1B84	World 6-4: 0x800D1D58	World 6-5: 0x
* World 7-1: 0x800D1DA0	World 7-2: 0x800D1E30	World 7-3: 0x800D1E9C	World 7-4: 0x800D1EE4	World 7-5: 0x

			
* World 1-1: 0x783F4	World 1-2: 0x784CC	World 1-3: 0x785EC	World 1-4: 0x78778	World 1-5: 0x
* World 2-1: 0x787C0	World 2-2: 0x788BC	World 2-3: 0x789DC	World 2-4: 0x78B44	World 2-5: 0x78CAC
* World 3-1: 0x78CF4	World 3-2: 0x78E14	World 3-3: 0x78F34	World 3-4: 0x79078	World 3-5: 0x79198
* World 4-1: 0x791E0	World 4-2: 0x79300	World 4-3: 0x79444	World 4-4: 0x79540	World 4-5: 0x79684
* World 5-1: 0x796CC	World 5-2: 0x797EC	World 5-3: 0x7990C	World 5-4: 0x79A74	World 5-5: 0x79BB8
* World 6-1: 0x79C00	World 6-2: 0x79CB4	World 6-3: 0x79DD4	World 6-4: 0x79FA8	World 6-5: 0x
* World 7-1: 0x79FF0	World 7-2: 0x7A080	World 7-3: 0x7A0EC	World 7-4: 0x7A134	World 7-5: 0x

• File Systems
• Geometry blocks