Cryptic crossword clue
Boundaries one first organised to include river

The most common and most likely answer to this crossword clue is the 9 letter word FRONTIERS

I've seen this crossword clue in The Guardian
F
R
O
N
T
I
E
R
S

Buddy explains!

The straight part
We know that "Boundaries" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boundaries = frontiers.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does FRONTIERS mean?

FRONTIERS noun
  1. The part of a country which borders or faces another country or unsettled region
  2. The most advanced or recent version of something; leading edge.
  3. An outwork of a fortification.

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