Over three million Lesser Scaup nest on the lakes of the western boreal forest and the prairies, then winter on the Gulf Coast, Florida and Chesapeake Bay. A year of their migration from eBird sightings and USGS band recoveries. #birdmigration #birds

Nearly three million Greater White-fronted Geese winter in the rice fields of Texas, Louisiana and Arkansas, then nest on the Arctic tundra from Alaska to Nunavut. A year of their migration from eBird sightings and USGS band recoveries. #birdmigration #birds

Germany nearly tripled after 1871, from 29 million to 83 million people. The five eastern states went the other way: fewer people live there today than in 1910. Data: GPOP (Rösel 2022), Destatis #Germany #maps

Lake Lucerne barely moved all week: surface water drifted about a kilometre a day, yet the basin off Gersau still turned anticlockwise while the Urnersee turned the other way. Data: Alplakes lake model, Eawag (CC BY 4.0) #LakeLucerne #Switzerland

The southern end of Lago di Garda turned slowly clockwise all week, one gyre filling the basin, and most afternoons the lake picked up speed. 11-17 Oct 2026, every three hours. Data: Alplakes lake model, Eawag (CC BY 4.0) #LakeGarda #Italy

Super Typhoon Champi's hurricane-force winds cover three times the area of Taiwan at their peak on Thursday. Most of it dies at sea before the eye comes ashore near Taitung Friday night. NOAA HAFS forecast, Oct 19. #Taiwan #typhoon

Manhattan peaked in 1910 at 2.3 million people and has never been that crowded since. One Lower East Side census tract held 44,000 people on 50 acres of tenements. Data: IPUMS NHGIS #NYC #Manhattan

Lac Léman sat almost still all week. Then on Saturday afternoon the whole lake woke up: by 8 PM its typical surface current was five times faster than that morning. Data: Alplakes lake model, Eawag (CC BY 4.0, adapted) #LacLéman

Vancouver Island and its neighbors have 28 lighthouses between them. The big stations sweep, harbour lights and beacons blink on the rhythm printed on the chart. Fisgard and Race Rocks, lit in 1860, were the first two on Canada's west coast. #VancouverIsland #Lighthouses #Maps

California's fall color starts above 9,000 feet in late September and reaches the valley floor around Sacramento in mid-November. 25 years of NASA satellite phenology. #fallfoliage #California

The Bay of Fundy has the highest tides in the world. On 11 October, Burntcoat Head rose and fell about 14 meters (46 feet), and all of it squeezes through Minas Passage, where the current tops 9 knots. Data: NOAA GoMOFS model #BayOfFundy #NovaScotia

In a typical autumn, the beech woods of the Ardennes and Luxembourg are half turned by mid-October, and the Netherlands holds on toward the end of the month. 25 years of satellite data, day by day. #fallfoliage #Benelux

In a typical autumn, the Carpathian beech of the Apuseni and Bucegi is half turned by mid-October, and the woods around Bucharest hold on into November. 25 years of satellite data, day by day. #fallfoliage #Romania

In a typical autumn, Šumava's mountain beech is half turned by about October 5, and the floodplain woods around Lednice wait until the end of the month. 25 years of satellite data, day by day. #fallfoliage #Czechia #podzim

In a typical autumn, the Carpathian beech around Synevyr is half turned by about October 8. Kyiv peaks in late October, and the beech of the Crimean mountains comes last. 25 years of satellite data, day by day. #fallfoliage #Ukraine

In a typical fall, the larches at Washington Pass turn gold in the first week of October, about a month before Seattle's trees peak. 25 years of NASA satellite phenology. #fallfoliage #PNW

Fall color takes about six weeks to cross the lower 48. It peaks first in California's high Sierra at the end of September and last on the same state's valley floor in November. 25 years of NASA satellite records. #fallfoliage

Iran's rivers carried about 720 cubic metres a second at the end of summer 2025 and about 121,500 on 28 March 2026, when the Zagros snow went. Roughly 170 times the flow, and much of it never reaches an ocean. #rivers #Iran