HUGE HYPE for our #CatchmentCup2025 WINNER by overwhelming majority: the ONÇA Catchment in Brazil!!! Thank you to everyone who voted for their favorite catchments throughout the past month to make this all possible. Happy last day of Catchment Cup and Happy Halloween 🎃 from AGU H3S! 🎉🎉🎉

IT'S TIME TO DETERMINE YOUR #CatchmentCup2025 WINNER! Our final two catchments are ONCA and JAGUARIBE (both named after jaguars!)! Keep an eye out for facts about these wonderful catchments posted today and VOTE for your winner at www.agu-h3s.org/rivercup until TOMORROW at 5 pm ET!!!

Check out some facts on the anthropogenic threats facing our FINAL FOUR catchments below 👇👇 and remember to KEEP VOTING at www.agu-h3s.org/rivercup #CatchmentCup2025

Say hello to your FINAL FOUR: Onca, Jaguaribe, McMurdo, and Yangtze!!! Stay tuned till TOMORROW to vote down to the TOP TWO catchments in #CatchmentCup2025 !!!

Only TWO HOURS left to get your votes in to narrow our Great Eight to our FINAL FOUR catchments. Vote at www.agu-h3s.org/rivercup until 5 pm EST!!! #CatchmentCup2025

Happy Friday!! Here are your #CatchmentCup2025 Great Eight!! Its time to NARROW down to the Fabulous Four! You have until Tuesday 10/28 to vote and check out the amazing papers from these sites here: www.agu-h3s.org/rivercup

Your Round 2 #CatchmentCup2025 Snow-dominated catchments are #HubbardBrook and #McMurdo !!! www.agu-h3s.org/rivercup Stay tuned for the last Round 2 match ups starting TOMORROW at 9 am ET!!

We are back for Round #2 Snow-dominated catchments: www.agu-h3s.org/rivercup The first match up contains two research POWERHOUSES! Hubbard Brook versus East River! You have until tomorrow at noon ET to cast your vote!

We are back for Round #2 Snow-dominated catchments: www.agu-h3s.org/rivercup The second match up is McMurdo versus Burabay watersheds! You have until tomorrow at noon ET to cast your vote!

let’s hear it for the winners of the first half of Round 2 of #CatchmentCup2025! Your #headwater senifinalists are the ONÇA and WALNUT GULCH! Your #rain-doninated semifinalists are the JAGUARIBE and PANOLA! Be sure to come back here on Monday, 10/20 for the next round: #snow-dominated catchments!

For the next matchup of Round 2, we have the Rain-Dominated catchments of the Upper Blue Nile vs Panola Mountain! SEE BELOW for some exciting info about these two catchments, and make sure your vote counts by voting at www.agu-h3s.org/rivercup by 4pm PT TODAY (10/16)

it’s the final countdown!!! one hour remains to get your votes in for your favorite #headwater catchments in round 2 of Catchment Cup 2025!!! head over to agu-h3s.org/rivercup by 4pm PT to cast your vote for the world’s most remarkable headwaters!! winners for the round will be announced at 5pm PT!

it’s time!! we have all of our round 1 winners! shout-out to the HEART CZO, Bulimba Creek, Yangtze River, and Waikato River for snagging the last four slots in round 2! and don’t forget to come back tomorrow am (10am ET) for the first matchups of #CatchmentCup2025 round 2: #Headwaters!

Welcome back to another round of #CatchmentCup2025! In our final matchups of round 1, eight HUMAN-IMPACTED catchments will compete head to head! Cast your votes at www.agu-h3s.org/rivercup until TOMORROW (10/14) 5 pm ET, and stay tuned for facts posted throughout the day about these catchments!

Every vote counts in #CatchmentCup2025 on our quest to find the most remarkable catchment in the world this year! If you haven't yet voted for your favorite SNOW-DOMINATED catchments, vote at www.agu-h3s.org/rivercup until 5 pm EST TODAY!!!

Drumroll please.....the winners of round 1's snow-dominated catchments are..... HUBBARD BROOK, EAST RIVER, BURABAY, and MCMURDO!!! Some of these matchups were close so keep those votes coming for human-dominated catchments starting next week, 10/13!!! #CatchmentCup2025

AND FINALLY: the fourth matchup of snow-dominated catchments in Round 1: McMurdo vs Tapado! VOTE VOTE VOTE!!! www.agu-h3s.org/rivercup #CatchmentCup2025

The votes are in!!! Check out your Round 1 #CatchmentCup2025 Rain-dominated WINNERS!!! See you TOMORROW for the next round: snow-dominated catchments!

Rain-dominated Round 1: Re Della Pietra Catchment vs Eel River Catchment Keep those votes coming at www.agu-h3s.org/rivercup !!! See below for facts:

The votes are in!!! Check out your Round 1 #CatchmentCup2025 Headwater WINNERS!!! See you tomorrow for the next round for Rain-dominated catchments!

CATCHMENT CUP IS LIVE! Whose ready to learn about some new (and old) research catchments?!? First up: HEADWATER CATCHMENTS VOTE HERE until 10/4: www.agu-h3s.org/rivercup

We hope that everyone had a happy first day of the 2026 Water Year! Tomorrow is the first day of Catchment Cup! Check back in the morning when the first round of polling opens up for Headwater Catchments! We are so excited to share facts and research from early career researchers at these sites!

AGU H3S invites you to submit an abstract to our session at #AGU25 Thinking Outside the Box Plot: Communicating Science Beyond the Paper! The session explores creative ways to communicate research. Conveners: @adischner.bsky.social @acarneiromar.bsky.social @gescilam.bsky.social Cee Nell Emily Ellis