This is part 45 of the puzzle series Around the World in Many Days. Each part is solvable on its own.

Dear Puzzling,

This is a Slitherlink puzzle. Draw a single continuous loop along grid lines that does not cross itself. Numbers indicate how many sides of the numbered cell are used for the loop. Ignore the grey lines and letters when solving the Slitherlink – those form a background puzzle that helps you find the final answer in the end.

Today I have visited a uniquely beautiful aquatic ecosystem. Unfortunately I was not allowed to dive in, but that may be for the best from a conservation standpoint. Can you guess where I am?

Love, Gladys.

Empty slitherlink puzzle
Solve on Penpa+
Background puzzle in a separate grid


The clock shapes can rotate but not move. Only the ones matching the Slitherlink solution are relevant.

Gladys will return in Pre-Emptive Travels.

  • $\begingroup$ It seems to me like the Penpa is not letting me mark edges as a line. It is only allowing me to mark crosses. $\endgroup$ Dec 1, 2023 at 14:40
  • 1
    $\begingroup$ @BenjaminWang I had the opposite problem but the solution is to click on "Tab", check composite, then click on "Composite" where it appears next to "Tab", and then click on "Loop" -> "Edge x" $\endgroup$
    – caPNCApn
    Dec 1, 2023 at 14:45
  • 3
    $\begingroup$ without a puzzle name, "gladys will return" sounds really ominous lol $\endgroup$
    – juicifer
    Dec 4, 2023 at 17:00
  • $\begingroup$ @jafe can we get a hint? $\endgroup$ Dec 5, 2023 at 1:04
  • $\begingroup$ @computer_goblin Done $\endgroup$
    – Jafe
    Dec 5, 2023 at 4:49

2 Answers 2


Gladys is at


Take the slitherlink solution as posted by 0x5453

enter image description here

and then

where possible rotate the circles to align the line segments with the slitherlink path. Thus the JEOL circle stays put, the YLAF rotates 270 degrees clockwise, the HSIP rotates 180 degrees, the AHNK does not rotate and the AEHL rotates 90 degrees.


for those circles where the edges match we read off, from left to right, using only the letters within the slitherlink border to see JELLYFISH LAKE:

the completed puzzle


Partial solution

Completed slitherlink:

completed slitherlink

Combined with background puzzle for convenience: slitherlink + background puzzle

Steps taken:

Start with corners and constrained pairs like adjacent 3s. step 1

Continue propagating constraints. In particular, the pair of possible edges on the 1 near the middle forces two of the edges on the adjacent 3, allowing us to fill in most of the bottom-right corner. step 2

Coloring some cells for parity to see if that tells us anything useful. step 3

It does! We can see that if dark gray was part of the green region, then it would form an island with the pair of 3s on the right side. Therefore, we can apply the correct colors and fill in a bit more. step 4

Continuing from around the middle-right area: step 5

Complete! step 6


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