 Hello, in this video we are going to digitize lines. We will digitize rivers on this topographical map. In the main menu go to layer, create layer, new geopackage layer. We will use the existing mountmarcy geopackage that we created before. For table name we use rivers. For geometry type we choose line string and we change the projection to the same that is used in this project. As an attribute we add the name of the river which is text data and click add to fields list. Then we click OK, a popup warns us if you want to overwrite or add the new layer. We want to add the new layer to the existing geopackage. Now we see the new empty layer in the layers panel. So go on the editing by clicking the pencil and add a line. Let's digitize this river. We always digitize rivers from the upstream to the downstream. The direction of the river is stored in the geometry of the layer. At locations where tributaries join we place a vertex. In that way we can later snap the tributary to the main river. Here again we place a vertex. When you are done you click write to complete the line. The FID is automatically generated as part of the geopackage attribute and we name the river cascade brook as written on the map. Click OK. Now the line symbol is a random symbol and it's not very clear so if we uncheck the topographical map you can clearly see the line. We'll change the styling in another video. Now we're going to add a tributary. Therefore it's important to switch on the snapping toolbar. You can find that by clicking right somewhere on the toolbar. Click the magnet and choose the active layer so it only snaps to an active layer. You can also snap to other layers. Choose 15 meters. I can test it. When my mouse comes within 15 meters it highlights the closest vertex. And I also digitize the tributary from the upstream to the downstream. If I make a mistake I can use backspace then it will go back one node. Here it snaps and with right I can complete this tributary and fill in the name of the river which is cascade brook. Let's also do the other tributaries. You see that I don't have a node there so it will snap to the next one and here's another one. Now I've digitized all the streams from the cascade brook. Let's do another river. Here we have the cedar brook and I also digitize it from the upstream to the downstream. And I click right to complete. I fill in the name and click OK. Now I can save the line by toggle off the editing or I can make still corrections. Simply click on a vertex and move it. I can use undo and it works similar to the points. Let's save it and check the attribute table. Here I see that every line of the cascade brook is a separate feature as well as the cedar brook. Sometimes you want to consider all the tributaries as one feature of the main river. And we can achieve that by dissolving using the name in this case. In the vector menu go to geoprocessing tools and choose dissolve. As an input layer I choose rivers and I select the name field as the field to dissolve. So all features with the same name will become one feature. I store the result in the geopackage and I call the output rivers dissolved. Click OK and run the algorithm. Close the dialog when it's done and check the attribute table. Here we see that cascade brook is selected and it becomes completely yellow. It's one feature. So in this video you've learned how to digitize lines, specifically rivers from the upstream to the downstream and how to dissolve tributaries so rivers become one feature.