交界

jiāojiè
  1. common boundary
  2. common border

CEDICT

Entry Composition

1 交 jiāo
  1. to hand over; to deliver; to pay (money); to turn over
  2. to make friends
  3. (of lines) to intersect
  4. variant of 跤 jiāo
2 界 jiè
  1. (bound form) boundary; border
  2. (bound form) realm