Based on your request for a muted color palette suitable for a map, I have generated a palette with 24 colors following your specified guidelines. Below is the JSON representation of the color palette:

json
{
  "palette_name": "Muted Map Palette",
  "colors": [
    {
      "name": "Muted Green",
      "hex_code": "
          
          #4A7C2D
       "
    },
    {
      "name": "Muted Green Variation 1",
      "hex_code": "
          
          #5A9A3D
       "
    },
    {
      "name": "Muted Green Variation 2",
      "hex_code": "
          
          #6ABF4D
       "
    },
    {
      "name": "Muted Green Variation 3",
      "hex_code": "
          
          #7AD05D
       "
    },
    {
      "name": "Muted Green Variation 4",
      "hex_code": "
          
          #8AE26D
       "
    },
    {
      "name": "Soft Yellow-Green 1",
      "hex_code": "
          
          #B0C36A
       "
    },
    {
      "name": "Soft Yellow-Green 2",
      "hex_code": "
          
          #C4D78B
       "
    },
    {
      "name": "Soft Yellow-Green 3",
      "hex_code": "
          
          #D8E5A1
       "
    },
    {
      "name": "Bright Yellow-Green",
      "hex_code": "
          
          #E3E74A
       "
    },
    {
      "name": "Light Yellow-Green",
      "hex_code": "
          
          #E9E99B
       "
    },
    {
      "name": "Unique Color",
      "hex_code": "
          
          #C2B280
       "
    },
    {
      "name": "Muted Brown",
      "hex_code": "
          
          #8B5742
       "
    },
    {
      "name": "Muted Brown Variation 1",
      "hex_code": "
          
          #9B6A52
       "
    },
    {
      "name": "Muted Brown Variation 2",
      "hex_code": "
          
          #AD7D62
       "
    },
    {
      "name": "Muted Brown Variation 3",
      "hex_code": "
          
          #C18F72
       "
    },
    {
      "name": "Light Brown",
      "hex_code": "
          
          #D2AFA2
       "
    },
    {
      "name": "Strong Teal",
      "hex_code": "
          
          #005B5B
       "
    },
    {
      "name": "Strong Teal Variation 1",
      "hex_code": "
          
          #007B7B
       "
    },
    {
      "name": "Strong Teal Variation 2",
      "hex_code": "
          
          #009B9B
       "
    },
    {
      "name": "Strong Burgundy",
      "hex_code": "
          
          #4A2231
       "
    },
    {
      "name": "Strong Burgundy Variation 1",
      "hex_code": "
          
          #6B2D3B
       "
    },
    {
      "name": "Strong Burgundy Variation 2",
      "hex_code": "
          
          #8C3845
       "
    },
    {
      "name": "Muted Gray",
      "hex_code": "
          
          #A0A0A0
       "
    },
    {
      "name": "Light Gray",
      "hex_code": "
          
          #BFBFBF
       "
    },
    {
      "name": "Dark Gray",
      "hex_code": "
          
          #7D7D7D
       "
    }
  ]
}

Palette Description:

This muted palette consists of 24 colors tailored for a map design, with a focus on muted and neutral tones. The first color is a strong muted green with four variations that capture different shades of green. The second color is a soft yellow-green with six variations, three of which are more vibrant and three that serve as lighter tones for subtler distinctions. The third color is a unique, muted brown. The fourth color is a muted brown with three tonal variations. The fifth color features a strong teal with three variations, while the sixth color is a strong burgundy with three tonal variations, providing hachure options for the map. Finally, the palette includes various shades of gray to complement the overall muted aesthetic.

If you have any specific preferences for additional adjustments or variations, feel free to let me know!