In the north-west of Poland is the Baltic seacoast, which extends from the Bay of Pomerania to the Gulf of Gdańsk. This coast is marked by several spits, coastal lakes (former bays that have been cut off from the sea), and dunes. The largely straight coastline is indented by the Szczecin Lagoon, the Bay of Puck, and the Vistula Lagoon. The centre and parts of the north lie within the North European Plain.
About the stamps
The first stamp is part of Polish Mansion Houses set, about which I wrote here.
2015.06.26 - Sunflower (1 PLN) - It's on the postcard 2100
2015.09.15 - Rose (5 PLN) - It's on the postcard 2029
2015.09.15 - Lotus (10 gr) - It's on the postcard 2086
2015.12.07 - Lilac (5 gr) - It's on the postcard 2086
2016.01.20 - Centaurea (50 gr)
2016.04.22 - Papaver (10 PLN)
2016.07.06 - Crocus (20 gr) - It's on the postcard 3123
2016.07.15 - Lilium (6 PLN)
2016.07.22 - Iris (2 PLN) - It's on the postcard 2748
2016.10.20 - Cranberry (15 gr)
Sender: Krystyna Betiuk (direct swap)
Sent from Słupsk (Pomerania / Poland), on 02.11.2015