heathiest

/ˈhiːðiɪst/
adjective
  1. Superlative form of heathy: most covered with or characteristic of heathland.
    • Among all the regions, this is the heathiest, with miles of untouched moorland.
    • The heathiest part of the park is the high ridge where heather grows thickest.
    • They chose the heathiest spot for their picnic, surrounded by purple flowers.