More mass graves are being dug on this satellite image from April 9th, here in Vila Formosa, a neighbourhood in Sao Paulo. At least 160 plots are visible here, in a city that's lost at least 990 people to the disease.

On April 9th there were roughly half as many deaths as today

Here, in a cemetery on the SE outskirts of London (Chislehurst) are two mass-graves measuring 25m long each.
https://www.google.com/maps/place/51%C2%B025'40.3%22N+0%C2%B004'55.1%22E/@51.427855,0.0813519,198m/data=!3m2!1e3!4b1!4m13!1m6!3m5!1s0x47d8abfd0456cc95:0x36d5121bdde21e95!2sGreenAcres+Kemnal+Park+Cemetery+and+Ceremonial+Park!8m2!3d51.4277916!4d0.0832749!3m5!1s0x0:0x0!7e2!8m2!3d51.4278553!4d0.0819838
This imagery is from April 10th.

Here are roughly 7,000 plots in a cemetery in Ecuador: https://twitter.com/Nrg8000/status/1251881434794520577

This satellite image from April 6th shows the mass-graves being dug on Hart Island in New York's the Bronx. The main grave is about 70m long.

https://www.google.com/maps/place/40%C2%B051'01.4%22N+73%C2%B046'11.5%22W/@40.850374,-73.7704172,208m/data=!3m2!1e3!4b1!4m14!1m7!3m6!1s0x89c28c0d7b34078d:0xfea675f600d04b25!2sHart+Island!3b1!8m2!3d40.8536269!4d-73.7705846!3m5!1s0x0:0x0!7e2!8m2!3d40.8503741!4d-73.7698697

As reported by the Washington Post in March, the city of Qom was constructing mass graves. On March 1st, roughly 90m of mass-grave trenches had been dug. By April 18th that had increased to at least 295m, likely 375m.
https://www.google.com/maps/place/34%C2%B043'05.7%22N+50%C2%B052'45.3%22E/@34.718238,50.8785498,284m/data=!3m2!1e3!4b1!4m9!1m2!2m1!1sBehesht+Masoumeh+cemetery!3m5!1s0x0:0x0!7e2!8m2!3d34.7182381!4d50.8792404

More mass graves in Guayaquil, Ecuador (h/t @john_marquee). In this image from April 16th there are approximately 90m worth of trenches, with bulldozers still on site. In the image there are approximately 16 coffins for 16m, so that suggests these plots could fit 90 people.

No usable satellite imagery for Manaus yet, but this AFP photo alone shows 192 burial plots filled in a cemetery in the city at the heart of the Amazon. That one fewer death than the entire state has recorded from COVID full stop. In this one photo. The real number is unknowable.