Night wetland is a real field recording of frogs and crickets after dark, near Felipe Carrillo Puerto, Quintana Roo, Mexico. Felix Blume recorded it on October 30, 2015, and released it under CC0 into the public domain — the actual sound of that place, that night, looped so it can play as long as you like.
Where was it recorded?
Near Felipe Carrillo Puerto, in the Mexican state of Quintana Roo, on the Yucatán Peninsula. Felix Blume made the recording on October 30, 2015, as part of the Biosphere Soundscapes residency, and its source states a full GPS location alongside that date, which is how greensound can name the place this precisely rather than only the state or the region.
What is the Sian Ka'an Biosphere Reserve?
Sian Ka'an has been a UNESCO World Heritage Site since 1987 (whc.unesco.org/en/list/410). This recording's own title on Freesound names it directly: "Wetland at night, frogs and crickets in the Sian Ka'an Biosphere Reserve." Its map pin, though, gives a more specific point, near Felipe Carrillo Puerto, which is the place name this page and the mixer's info panel both use.
What are you hearing?
Frogs and crickets — the source's own title for this recording. We don't name which species, because the source doesn't either, and greensound never states more provenance than a recordist actually gives. Nothing here is a synthesized noise color standing in for a wetland; it's the recorded sound of one particular night, in one particular place.
Is it looped?
Yes. What plays is a loop cut from the original recording, not an endless file, with a 2-second equal-power crossfade baked into the seam so it can't click, though a close listener may still notice the content come back around. It was cut to a window of twenty to forty seconds and brought by one fixed amount to the same loudness target as the other sounds; nothing else was changed.
Where the sound comes from
Listen safely
This is a sound, played back through whatever speaker or headphones you already own. It doesn't diagnose, measure, or promise anything about how you sleep, focus, or feel — it's just noise and a handful of real recordings, mixed the way you like them.
Keep the volume low enough that you'd still notice a smoke alarm, a phone ringing, or someone at the door. If you fall asleep in headphones, choose a volume and a pair you'd be comfortable wearing all night, and a session length that ends when you'd want the sound to stop.
If you use this near a baby, keep the speaker several feet from the crib, never inside or clipped to it, and keep the volume low — the same care you'd take with any sound machine in a nursery.
If your relationship with sound, or with sleep, feels difficult rather than simply restless, a doctor or audiologist is the right person to talk to. This is a mixer, not a clinician.
Is this a real recording or a synthesized sound?
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It's real, not synthesized. Nothing about it is generated; it's the actual sound of that place, that night, looped so it can play for as long as you'd like.
Who recorded it, and can I hear more of their work?
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It was recorded by Felix Blume and released to the public domain under a CC0 license. The link under "Where the sound comes from" goes straight to the original upload, where you can find more of their field recordings.
What does "public domain" mean for a recording like this?
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A CC0 license means the recordist has waived their copyright, so the file can be used, shared, and built on by anyone without needing separate permission. We still credit Felix Blume by name here, because a recording made by a real person in a real place deserves that credit even when the license doesn't require it.
Is this sound free?
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Yes, fifteen minutes a day. This sound is free to play for fifteen minutes a day, with a fade at the end, and Pause keeps the minutes you have left. Pro adds the full mixes, layering, longer timers, and new recordings first.
Will more real recordings like this one be added?
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Yes. Beach waves, jungle rain, cenote bird and far shore have joined it, and more are planned, each credited the same way: the recordist, the place and the date wherever the source gives them, or not added at all.